<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			*{
				margin:0px;
				padding:0px;
			}
			.box{
				width:800px;
				height:3000px;
				background:#ccc;
				margin:20px auto;
			}
		</style>
	</head>
	<body>
		<div class="box"></div>
	</body>
</html>
